I don't know if someone said this already, I think the reason is how our ears hear it.In your head, you know who sometimes people say 'i can't hear myself talk / think!' Well, you both 'hear' (plan) what you say in your head, and when you talk it out, it's different than what you think.Just get used to how you sound, and try talking with your hands covering your ears, LOL. xD

Well, it depends on your Operating system. If you're on a Windows Vista or 7 click "Vista, Windows7 Driver (32bits) Driver only (ZIP file)". However, you'll need a program that can unzip it like WinRAR or WinZIP